214 
FOURTEENTH REPORT. 
The two small peninsular projections, (Fig I d), into the body cavity 
(g) are the sex glands. In each is a germ cell (Fig. 2 f), showing the 
characteristics mentioned above. 
Figure 3 is from a sagittal section thru the sex gland of an embryo 
(93Aa) in a stage similar to that of embryo 105 Ab (Figs. I, 2). Numer- 
ous germ cells are present in the sex gland (d). 
Figure 4 is from a sagittal section thru the sex gland region of em- 
bryo 105Aa which is somewhat younger than embryo 105Ab. Germ 
cells (f) are shown in the sex gland. 
Figure 5 shows a small portion of the embryo 105Ac including a 
sex gland in which a germ cell (f) is present at the neck of fhe sex 
gland (d). 
In embyro OOAa which measures '4.75 mm. in length, the sex glands 
have not yet formed. In this stage the germ cells occur in the germinal 
ridge which later produces the sex glands. Figures 6 and 7 indicate 
the position of the germ cells (f) in the ridge just ventral to the 
Wolfian duct (Fig. 6. c). It was stages of this type which gave to 
Waldeyer and others the foundation for the Germinal Epithelial Theory. 
Figure 7 also shows germ cells (f) in the neck region of the gut wall. 
Figures 8, 9 and 10 are from embyro 84Ba which measures 3.5 mm. 
in length. In this stage only a few germ cells are found in the germinal 
ridge. Many are found in the gut entoderm in the process of mitosis. 
Others are found in positions ranging from that in the gut entoderm 
to that in the germinal ridge. Figure 8 shows one germ cell (f) in the 
splanchnic layer of the gut just ventral and to the left of the neck 
region of the gut mesentery. Figure 9 shows one germ cell (f) in the 
resting condition within the gut entoderm. Figure 10 represents a sec- 
tion thru the hind gut region showing at the dorsal portion of the gut 
two germ cells (f) in the process of division. In the same figure in the 
left wall of the gut is a germ cell (f) which shows a peculiar bilobed 
nucleus. This condition of the nucleus has been referred to by other 
investigators. Only a few cells with this feature were found in the 
study of the sections. The reason why more are not observed is prob- 
ably due to the fact that only a small number happen to be cut in such 
a plane as to show this peculiarity. 
It is impossible at the present time to report definitely the discovery 
of germ cells in a stage earlier than that shown in Figs. 9 and 10 
and described above. In one embyro 19Da thus far studied which is 
considerable younger, cells which may be germ cells were observed near 
the region of the primary entoderm where the gut is destined to form. 
More sections of embryos intermediate in age between 84Ba and 19Da 
are necessary to determine the validness of the above probability. 
Figure II is a cross-section of this embryo 191 )a thru the posterior 
region. No germ cells are represented but the section is interesting 
because of the large periblast nuclei (n) which are seen in the lower 
part of the figure. These nuclei are represented here because so little is 
certain in regard to their functions and future fate. These nuclei are 
believed to arise from the marginal cells of the germ disc at a stage dur- 
ing gastralation. Their function is probably a physiological one. They 
are supposed to work over the yolk in such a way that it can be more 
readily absorbed. In many instances, a yolk granule (Fig. 12o), is pres- 
ent a l close proximity to such a periblast nucleus Fig. 12, n). Although 
